When David calls the support line to seek help after an error message appeared on his screen, he should be prepared to provide the following information: 1. The error message code. 2. The date the computer was purchased. 3. The make and model of his computer. The name of his favorite MP3 file and the make of his friend's computer are irrelevant and not needed.

 When David calls the support line for assistance with an error message on his computer, it is important that he provides specific information to help the support team diagnose and resolve the issue. Here is why the three pieces of information he should be prepared to provide are relevant:

1. The error message code: Error messages often come with specific codes that can indicate exactly what kind of problem the computer is encountering. These codes can be used by technical support to quickly identify common issues and provide accurate troubleshooting steps or solutions.

2. The date the computer was purchased: Knowing the purchase date can help support determine if the computer is still under warranty, which could affect the types of services and repairs that might be available to David. It can also provide a clue about the generation and likely specifications of the hardware, as computer models are frequently updated.

3. The make and model of his computer: Different makes and models come with various hardware and software configurations. This information allows support staff to provide tailored advice that reflects the specifications and quirks of David's specific computer.

The name of his favorite MP3 file and the make of his friend's computer are indeed irrelevant for troubleshooting his computer issue. The favorite MP3 file does not provide any useful information regarding the system error, and the make of his friend's computer has no bearing on David's own computer's problems.